Shell pipeline in Ruby?

From	Michal Suchanek <hramrach@centrum.cz>
Newsgroups	comp.lang.ruby
Subject	Shell pipeline in Ruby?
Date	2011-05-12 11:05 -0500
Organization	Service de news de lacave.net
Message-ID	<BANLkTik15O2NLu4grCfhbtF3Ws6N_c4Qtg@mail.gmail.com> (permalink)

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Hello,

how do you write an equivalent of

$ cmdA | cmdB | cmdC

in Ruby?

Specifically, I would like to see the PID, return value and stderr of
each of these commands but I would like cmdB to read the stdout of
cmdA directly, on its stdin, and similarily for cmdC and cmdB.

Here I am not interested in feeding cmdA some particular input (eg. it
can read /dev/null for all I care) but in general gluing arbitrary fd
to its stdin might be desirable in other cases.

Thanks

Michal

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Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-12 11:05 -0500
  Re: Shell pipeline in Ruby? Jos Backus <jos@catnook.com> - 2011-05-12 12:22 -0500
    Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-12 14:41 -0500
      Re: Shell pipeline in Ruby? Stu <stu@rubyprogrammer.net> - 2011-05-12 14:54 -0500
        Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-12 15:15 -0500
  Re: Shell pipeline in Ruby? 7stud -- <bbxx789_05ss@yahoo.com> - 2011-05-12 13:06 -0500
  Re: Shell pipeline in Ruby? Roger Pack <rogerpack2005@gmail.com> - 2011-05-12 22:13 -0500
    Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-13 03:33 -0500
      Re: Shell pipeline in Ruby? Roger Pack <rogerpack2005@gmail.com> - 2011-05-13 08:44 -0500
    Re: Shell pipeline in Ruby? Roger Pack <rogerpack2005@gmail.com> - 2011-05-13 08:48 -0500
      Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-13 13:14 -0500
  Re: Shell pipeline in Ruby? Robert Klemme <shortcutter@googlemail.com> - 2011-05-13 03:44 -0500
    Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-13 08:27 -0500
      Re: Shell pipeline in Ruby? Robert Klemme <shortcutter@googlemail.com> - 2011-05-13 09:23 -0500
        Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-13 12:44 -0500
  Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-13 10:32 -0500
    Re: Shell pipeline in Ruby? Brian Candler <b.candler@pobox.com> - 2011-05-14 10:05 -0500
      Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-16 06:05 -0500
  Re: Shell pipeline in Ruby? Brian Candler <b.candler@pobox.com> - 2011-05-14 10:14 -0500
  Re: Shell pipeline in Ruby? Michal Suchanek <hramrach@centrum.cz> - 2011-05-16 10:29 -0500

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